How do you choose which aftermarket shock to use? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 06-06-2011, 11:38 PM Thread Starter
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How do you choose which aftermarket shock to use?

Dariv has some *412 Progressive Shocks* for sale that he has only used for two months.
https://www.vn750.com/forum/showthread.php?t=18600

He says he needs the heavy duty ones. I went to this link he provided, and tried to figure out how a person chooses the right ones.
http://www.progressivesuspension.com...ies/index.html

I was able to do a search and find this chart of shocks that will fit the vn750:
http://www.progressivesuspension.com...41&modelID=452

There are 7 different series available in the stock 12 1/2" length. (Those are highlighted in yellow print).
Then there are 3 shorter lengths, the shortest being 11", to allow lowering the frame at the rear.

(I will put aside the *damper only* series 12 for now.)
I`m trying to understand the difference between the series 412, 430 and 440 shocks, in both regular and Heavy Duty versions.

There was a reference to the series 412 as the *BEST VALUE* (lowest cost) shock, so I think this may be a *Good, Better, Best* scenario.
Are the internals of the three series identical, (or nearly so), and the differences mostly cosmetic?

Can anyone help me understand these differences?
I`m not looking to buy new shocks just now, only to understand the options.
Thanks.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 06-06-2011 at 11:51 PM.
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post #2 of 4 (permalink) Old 06-07-2011, 07:12 AM
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You kind of answered your own question here ... The "Good, Better, Best" line....

Can't look over all the shocks here, but what you should be paying for as the price increases is better components.... Better seals, stronger shafts, better or more tunable controls for dampening, preload and cosmetics running dead last.

When picking a shock, you have to look at how it will be used, how often or how hard.

Heavy Duty shocks are usually made for two up riding with luggage, or.... If you are pretty "heavy" yourself. If you are under 200 lbs and never carry any additional loads, standard shocks should be fine.

Better shocks are more resistant to hard use. As the Vulcan is not a race bike, and most owners do not push it to it's limits on every ride, it be difficult to rationize spending ALOT of money on rear shocks for the bike.

If you plan on touring the country for a year, a better grade of shock would make sense, but even the low price 412s are far better than the stock units.

As a note , if you are , uh, big... You can order the shocks with stiffer springs. They should have a salesman you can talk to that will guide you in picking the right spring and shock for your application.

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post #3 of 4 (permalink) Old 06-07-2011, 08:05 AM
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Ooopps.... Did want to say I had a set of "pre-owned" 412s on my bike and was very pleased with them. I also had Progressive fork springs and a Superbrace fork brace.... Do not think the bike could have handled better unless you got Vallintino Rossi to ride it for me...

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post #4 of 4 (permalink) Old 06-07-2011, 10:10 AM Thread Starter
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Thanks KM for the *Shocks 101* course. I will spend a little more time researching that site, and see what else I can learn about the specifics of the different series.

From what I have read so far, it seems the 412 series does make the most sense for running on the vn750.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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